Overpayments. To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account. The client will have 30 days from the date of the Overpayment letter to submit the request and supporting documents.Providers have the option to submit a Request For Extended Repayment Schedule (ERS). A complete ERS request should be submitted immediately. When you identify a Medicare overpayment, use the Overpayment Refund Formto submit the voluntary refund. If we have identified an overpayment and request a refund, please mail the check along with a copy of the overpayment request letter we sent you. The purpose of an overpayment demand letter is to notify the providers and suppliers of the existence and amount of an overpayment, and to request repayment. Click here to search for any overpayments on your PIN.